Used to check message signatures against Vipul's Razor collaborative
filtering network. Razor has a large number of dependencies on CPAN
modules. Feel free to skip installing it, if this makes you nervous;
SpamAssassin will still work well without it.

***************************************************************************
NOTE: the optional Net::Ident module is not installed.

If you plan to use the --auth-ident option to spamd, you will need
to install this module.

***************************************************************************
NOTE: the optional IO::Socket::INET6 module is not installed.

This is required if the first nameserver listed in your IP
configuration or /etc/resolv.conf file is available only via
an IPv6 address.

***************************************************************************
NOTE: the optional IO::Socket::SSL module is not installed.

If you wish to use SSL encryption to communicate between spamc and
spamd (the --ssl option to spamd), you need to install this
module. (You will need the OpenSSL libraries and use the
ENABLE_SSL="yes" argument to Makefile.PL to build and run an SSL
compatibile spamc.)

***************************************************************************
NOTE: the optional Time::HiRes module is not installed.

If this module is installed, the processing times are logged/reported
more precisely in spamd.